[libredwg] [bug #31867] opening a file with an unsupported dwg revision could cause a segfault

[Otso Helenius]

Follow-up Comment #1, bug #31867 (project libredwg):

I can verify this bug.

My test file (at
https://pi-xi.net/share/libredwg/AutoCAD_Architecture_2011_Student_Version_R2010_Test_1.dwg)
contains one polyline and two annotative dimensions (seen here:
https://pi-xi.net/share/libredwg/AutoCAD_Architecture_2011_Student_Version_R2010_Test_1.png)

Running

./testSVG AutoCAD_Architecture_2011_Student_Version_R2010_Test_1.dwg >
test1.svg

causes a segfault. There is no stderr output whatsoever (exported
LIBREDWG_TRACE=3). Trying it on the example.dwg works fine

I also noticed that just running ./testSVG foobar (when foobar is a
nonexisting or existing file) causes a segfault except when using with the
libredwg example DWGs.

I tried out an empty R2007 file (at
https://pi-xi.net/share/libredwg/AutoCAD_Architecture_2011_Student_Version_R2007-LT2007.dwg),
it produced also a segfault but also stderr output which I have attached here
(R2007.out). I did the same with R2004 and R14 exported DWG files (empty as
well). R2004 produced a segfault as well but no stderr output, R14 exported
correctly.

I am running it on Fedora 14 x86_64 compiled from a snapshot (27.01.2011). I
have created all the DWGs with Autodesk AutoCAD Architecture 2011 Student
version available from http://students.autodesk.com/. It is an exact replica
of the full retail version except for the licensing which has to be renewed
every year.

(file #22534, file #22535)
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Additional Item Attachment:

File name: R14-LT98-LT97.out              Size:2 KB
File name: R2007.out                      Size:9 KB


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